git: f20f690939 - main - Remove reference to sio(4)

The branch main has been updated by thj:

URL: https://cgit.FreeBSD.org/doc/commit/?id=f20f69093944d8302ddb666c7abe275f50be8809

commit f20f69093944d8302ddb666c7abe275f50be8809
Author:     Tom Jones <thj@FreeBSD.org>
AuthorDate: 2025-09-09 15:09:16 +0000
Commit:     Tom Jones <thj@FreeBSD.org>
CommitDate: 2025-09-10 09:09:21 +0000

    Remove reference to sio(4)
    
    Summary:
    sio(4) was removed from the build in 2009 and removed as a driver in
    2019 by src commit 71f0077631fa.
    
    Reviewers: #doc_committers
    
    Differential Revision: https://reviews.freebsd.org/D52459
---
 documentation/content/en/books/handbook/advanced-networking/_index.adoc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/documentation/content/en/books/handbook/advanced-networking/_index.adoc b/documentation/content/en/books/handbook/advanced-networking/_index.adoc
index b82226bb9f..42125e86d7 100644
--- a/documentation/content/en/books/handbook/advanced-networking/_index.adoc
+++ b/documentation/content/en/books/handbook/advanced-networking/_index.adoc
@@ -877,7 +877,7 @@ The Bluetooth stack in FreeBSD is implemented using the man:netgraph[4] framewor
 A broad variety of Bluetooth USB dongles is supported by man:ng_ubt[4].
 Broadcom BCM2033 based Bluetooth devices are supported by the man:ubtbcmfw[4] and man:ng_ubt[4] drivers.
 The 3Com Bluetooth PC Card 3CRWB60-A is supported by the man:ng_bt3c[4] driver.
-Serial and UART based Bluetooth devices are supported by man:sio[4], man:ng_h4[4], and man:hcseriald[8].
+Serial and UART based Bluetooth devices are supported by man:ng_h4[4] and man:hcseriald[8].
 
 Before attaching a device, determine which of the above drivers it uses, then load the driver.
 For example, if the device uses the man:ng_ubt[4] driver: